Improvement in boiler-furnaces



U. 13, STRIBLING. BOILER "summon. No; 113,110. Patented Mar; 28; I871.

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URIAH esTRIBLINe, on MADISON.,IINDIANA.-

Letters Patent No. 113,110, dated March 28, 1871.

IMPROVEMENT IN BOILER-FURNACES.

The Schedule referred to in these Letters Patent and making part of the same.

I, URLAH B. STRIBLING, of Madison, county of .Jefi'erson, Indiana, have invented certain Improvements in Boiler Furnaces, of which the following is a full and clear specification.-

The first part of my invention consists in a combination of draught-pipes, consisting-of a series of tubes extending back from the grate-bars to a crosspipe, this latter being connected with a blower, uponwhich all the draught for the furnace depends, as the doors for admitting fuel and those of the ash-box are kept closed, except when in actual use. These pipes do not pass through the furnace-flue, but are placed sufiiciently low to prevent the temperature of the air from rising too high, but still be warm enough to prevent lowering theteinperature of the fuel.-

The second part of my invention relates to the peculiar form and construction of the grate-bar used.

The bars receive the draught from the tubes above mentioned and distribute it equally throughout the area of grate surface.

Another feature in the form of the bar tends to prevent the fuel from packing so closely to the bars as, to check the draught bystoppage of the holes in the bar for exit of the air, and thus insure more per-' fect combustion.

Figure 1 is a longitudinal vertical section of the furnace through the line x x, fig. 3.

Figure 2 is a plan of the furnace, showing the draught-tubes.

Figure 3 isca transverse vertical section of the boiler and furnace through the line a: x, figs. l and 2.

Figures 4, 5, and 6 are respectively the plan, section, and elevation of the grate-bar, drawn enlarged.

General Description.

A is the boiler;

B, the furnace; and

O, the ash-pit, constructed and arranged in the usual manner.

'J represent the grate-bars, the peculiar construction of which will be described further on.

A draught-pipe, E, connects a blower (not shown) with a transverse pipe, F.

To this pipe are attached the smaller draughttubes at a, equal in number to the grate-bars used.

The aggregate capacity of thesetubes should correspond withthe capacity-of the draught-tube E.

The draught-tubes a 0. connect with the rear ends of the grate-bars, each to each; and if the cross-pipe F is situated as indicated in the drawing, these pipes or tubes will extend back under the furnace-flue a vsufiicient depth below the said flue to warm the air enongh to prevent any decrease in temperature, but

not heat it too much., 7

The bar' is cored out, as at G, so as to be hollow throughout its entire length, (see fig. 5,) except that the .front end is closed.

1 The rear end is'tapped to receive the tube a, which may be secured thereto in any manner, but preferably by a thread cut on the tube.

Through the upper side of the grate-bar are drilled holes b b, at suitable distances apart, which open intothe hollow G of the bar.

The aggregate area of these holes should about equal the area of the tubes a, so that the air may be equally distributed along the bar.

The fuel is prevented from packing down too close to the bar and obstructing the draught, by grooving the top of the bar lengthwise, as at c, fig. 5, and the projecting ledges formed by this groove are out laterally, so as to form corrugations, as shown at c e, figs.

hollow grate-bars J, and all arranged to operate in the manner substantially as shown, and for the purposes set forth.

2. A grate-bar, J, with a hollow, G, perforations 'b b, groove 0, and corrugated edges 0 e, substantially as shown, and for the purposes set forth.

URIAH B. STRIBLING.

Witnesses: v

HENRY OONNETT, J r., BART BILLINGS. 

